function cboWebname_onchange(cboWebname)
{
  alert("1");
  if(cboWebname.selectedIndex >= 0)
  {
    alert("2");
    var strUrl = cboWebname.options[cboWebname.selectedIndex].value;
    alert("3");
    window.open(strUrl,
                'mywindow',
                'toolbar=yes,location=yes,directories=yes,status=yes,menubar=yes,scrollbars=yes,copyhistory=yes,resizable=yes')
    alert("4");
  }
}

